Examine source code of Duplicate Tab

{
  "description": "Duplicates the current tab",
  "homepage_url": "https://github.com/Skeletonxf/duplicate-tab/",
  "manifest_version": 3,
  "name": "Duplicate Tab",
  "version": "3.0",
  "permissions": [
    "contextMenus",
    "storage",
    "activeTab"
  ],
  "background": {
    "page": "/background-page.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{54fa1e34-a0ad-4526-a81b-b06139adf332}",
      "strict_min_version": "115.0"
    }
  },
  "action": {
    "default_icon": "icons/fork.svg",
    "default_title": "Duplicate Tab",
    "theme_icons": [
      {
        "dark": "icons/fork.svg",
        "light": "icons/fork-dark.svg",
        "size": 32
      }
    ]
  },
  "options_ui": {
    "page": "/settings/settings.html"
  },
  "commands": {
    "duplicate-shortcut-1": {
      "suggested_key": {
        "default": "Alt+Shift+D"
      },
      "description": "Duplicate current tab shortcut 1"
    },
    "duplicate-shortcut-2": {
      "description": "Duplicate current tab shortcut 2"
    },
    "duplicate-shortcut-3": {
      "description": "Duplicate current tab shortcut 3"
    },
    "advanced-duplicate-shortcut-1": {
      "suggested_key": {
        "default": "Alt+Shift+A"
      },
      "description": "Advanced Duplication shortcut"
    }
  }
}